The debate over indoor versus outdoor cat keeping involves genuine welfare tradeoffs between the enrichment of outdoor access and the safety risks of outdoor environments, with no universal answer.
The indoor-outdoor cat welfare question involves genuine competing welfare interests. Outdoor access provides environmental enrichment, exercise, and behavioral expression that indoor environments often fail to match. Indoor cats without adequate enrichment develop behavioral pathologies including overgrooming, aggression, and depression from boredom and frustration. However, the outdoor environment poses severe risks: the dramatic lifespan difference between indoor and outdoor cats reflects real mortality from traffic, predation, disease, and human violence. The optimal solution for both cat welfare and wildlife welfare is supervised outdoor access through catios, enclosures, or leash walking - providing enrichment without the risks of uncontrolled outdoor roaming.